The official Fitbit app was released for Windows Phone devices few month back. The Fitbit Windows Phone app features all the basic things you expect from a fitness tracking app. You can use it to start tracking all-day activity, workouts and health. This app makes use of Bluetooth 4.0 LE to sync your Fitbit device with your phone. Today, this app got updated to v18.104.22.16842 in Windows Phone Store. This update adds support for Cortana in the UK and Australia. It also includes support for some additional languages.
New Language Support
* Chinese Simplified
* Chinese Traditional
* Support for UK and AU
Various minor improvements and bug fixes
Download the app from Windows Phone Store here.